Dynamic response analysis of blocks-combined dam under impact load
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e-mail: [email protected] http://jms.imde.ac.cn https://doi.org/10.1007/s11629-019-5619-0
Dynamic response analysis of blocks-combined dam under impact load GAO Fang-fang TIAN Wei*
https://orcid.org/0000-0003-0432-3459; e-mail:[email protected]
https://orcid.org/0000-0001-6480-4321;
e-mail: [email protected]
*Corresponding author School of Civil Engineering, Chang'an University, Xi’an 710061, China Citation: Gao FF, Tian W (2020) Dynamic response analysis of blocks-combined dam under impact load. Journal of Mountain Science 17(11). https://doi.org/10.1007/s11629-019-5619-0
© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: In order to reduce the damage of ordinary gravity dam impacted by boulders in debris flow, a blocks-combined dam based practical project is proposed. The dynamic response of the proposed dam under impact load is investigated by using ABAQUS finite element software. Considering the impact velocity and impact height, the anti-impact performance of blocks-combined dam is discussed in terms of deformation, displacement, impact force, acceleration, and energy, and is compared with that of ordinary dam. Results show that the displacement, impact force and acceleration of dam increase with the increase of impact velocity and height. The impact energy of blocks-combined dam is mainly absorbed and consumed by the friction between the component interfaces, which is related to the location of impact point. Compared with the ordinary gravity dam, the blocks-combined dam has better impact resistance to boulders in debris flow. Keywords: Impact load; Blocks-combined dam; Unbonded post tensioned steel strand; Debris flow; Dynamic response; Numerical simulation
Introduction Debris flow is a kind of natural disaster that Received: 03-Jun-2019 1st Revision: 12-Aug-2019 2nd Revision: 25-Oct-2019 3rd Revision: 15-Jul-2020 Accepted: 25-Aug-2020
often occurs in mountain area. It is a special stream that broke out suddenly, short history and ferocious, formed by heavy precipitation (rain, snow and glacier), and mixed with large amounts of solid material such as sediment, stones and so on (Tang et al. 2009; Cui et al. 2011; Hu et al. 2011). China is vast in territory, and more than two thirds of the land is mountains or semi-mountainous. These areas have complicated geological condition, with high mountains, steep slopes, broken surface, the rainstorm concentration, low vegetation coverage and frequently happened earthquakes, which provide favorable natural conditions for the development of debris flow, and make the country the mostly affected by debris flow in the world. In recent years, many serious mudslide disasters have occurred in China (Fan et al. 2018; Chen et al. 2018), which have caused great harm to human life safety and social economic development (Cascini et al. 2013). Previous researchers adopted different solutions to obstruct debris flow, to reduce its mobility, to deflect it direction or to dissipate flow ene
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